[issue41176] revise Tkinter mainloop dispatching flag behavior

E. Paine added the comment: Apologies, it is not waiting for the tcl queue and instead the call waits indefinitely for `Tcl_ConditionWait` (tkinter adds it to the queue and then waits for the command to finish executing). Do we need some mechanism to alert people after a second, for

[issue41176] revise Tkinter mainloop dispatching flag behavior

E. Paine added the comment: I have just finished reviewing the proposed PR, and am happy with the content. During the process of developing the PR, we established that the behaviour that should be deprecated is the error after a second of waiting in a thread. Instead, on `WaitForMainloop`

[issue41176] revise Tkinter mainloop dispatching flag behavior

Richard Sheridan added the comment: I'm planning to write the long-awaited Tkinter Internals section of the docs. (https://github.com/python/cpython/blame/master/Doc/library/tk.rst#L48) I've spent too much time at this point to let it all go down the memory hole. Unfortunately, I don't know

[issue41176] revise Tkinter mainloop dispatching flag behavior

Richard Sheridan added the comment: I'd like to consider one more possibility for future behavior that sort of came to mind while discussing the PR. In current behavior, it is possible to use `willdispatch` to trick `WaitForMainloop` into letting a thread pass through the timeout, where it

[issue41176] revise Tkinter mainloop dispatching flag behavior

Change by Richard Sheridan : -- keywords: +patch pull_requests: +20448 stage: -> patch review pull_request: https://github.com/python/cpython/pull/21299 ___ Python tracker

[issue41176] revise Tkinter mainloop dispatching flag behavior

Richard Sheridan added the comment: Removing `WaitForMainloop` would surely break some existing programs, but that's why I suggested deprecation instead of just removing it suddenly. We could issue a RuntimeWarning if `WaitForMainloop` actually waits and tell the client to take responsibility

[issue41176] revise Tkinter mainloop dispatching flag behavior

E. Paine added the comment: I agree it would be helpful to expose an explicit way of telling if the mainloop was running but am not sure about removing `WaitForMainloop` as it could very easily break existing programs. If a program executes a tkinter method in a thread before the mainloop

[issue41176] revise Tkinter mainloop dispatching flag behavior

New submission from Richard Sheridan : This could also be considered a "behavior" type issue. `TkappObject` has a member `dispatching` that could usefully be exposed by a very simple read-only method for users to determine at runtime if the tkinter mainloop is running. Matplotlib and I'm